Most clients are now upgrading their D365 Online from 8.2 version to the newer 9.0 / 9.1 versions. Now, I know D365 App For Outlook is the way to go. However, some clients want to stick their classic flow of Set Regarding from the Outlook client (even though D365 App For Outlook seamlessly provide all of this)

If you’re planning that you start upgrading users’ D365 For Outlook version to v9 so that you can set them up already even before D365 goes to v9, then this won’t work.

Here’s the link to download the version 9 of the Dynamics 365 For Outlook – https://www.microsoft.com/en-us/download/details.aspx?id=56972

But, if you update the existing version to the one above and expect it to connect to your 8.2 D365, it won’t work and give you the following error –

And you can the details which mentions that the current version is too high

Conclusion

Plan your upgrade for D365 to v9 such that you get ample time to upgrade the v9 version of your D365 For Outlook too.